feat(ci): add php8.4

Author: Rotzbua

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [ '8.1', '8.2', '8.3' ]
+        php: [ '8.1', '8.2', '8.3', '8.4' ]
         ext_base: [ 'none, dom, tokenizer, xml, xmlwriter,' ]
         ext_lib: [ 'curl, mbstring, openssl,' ]
         ext_optional: [ '', 'bcmath', 'gmp' ]
@@ -68,6 +68,7 @@ jobs:
         run: composer test:typing
 
       - name: Run php-cs-fixer
+        if:  ${{ matrix.php != '8.4' }}
         run: |
           composer test:syntax
           composer test:syntax_tests